How should I apply this color shampoo to avoid uneven results?

Follow the package instructions first, since they are specific to this shampoo. As a general rule, color-depositing shampoos are applied to wet hair: distribute the product through the lengths, massage to create a light foam, leave it on briefly, then rinse thoroughly. The time it is left on affects how intense the final tone looks.

To reduce patchiness, start with hair that is evenly wet. Focus on lengths and ends, where faded color and roughness usually show most, and avoid concentrating the product only on the top of the head. Use an amount that covers the hair without heavy dripping; the tube is 40 ml, so plan the application carefully if your hair is long or thick.

A strand test before full application is the most reliable way to see how the color develops on your hair and how even it will look. After rinsing, blot the hair gently with a towel instead of rubbing it hard while damp, because rough handling can disturb the freshly deposited pigment.